linux/include/asm-generic/dma.h
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   1#ifndef __ASM_GENERIC_DMA_H
   2#define __ASM_GENERIC_DMA_H
   3/*
   4 * This file traditionally describes the i8237 PC style DMA controller.
   5 * Most architectures don't have these any more and can get the minimal
   6 * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS.
   7 *
   8 * Some code relies on seeing MAX_DMA_ADDRESS though.
   9 */
  10#define MAX_DMA_ADDRESS PAGE_OFFSET
  11
  12extern int request_dma(unsigned int dmanr, const char *device_id);
  13extern void free_dma(unsigned int dmanr);
  14
  15#endif /* __ASM_GENERIC_DMA_H */
  16
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